# coding: utf-8
# 2011 ©Bruno Chareyre <bruno.chareyre@hmg.inpg.fr>
"Demonstrate the compression of a periodic cell with non-trivial initial geometry."
from woo import *
from woo import pack,log,qt
O.periodic=True

O.cell.hSize=Matrix3(1.0, -0.15, -0.10,
             -0.2 ,1.5, 0.3,
            0.3, -0.3, 1.0)
sp=pack.SpherePack()
num=sp.makeCloud(hSize=O.cell.hSize, rMean=-0.01,rRelFuzz=.2, num=500,periodic=True, porosity=0.52,distributeMass=False)
O.bodies.append([utils.sphere(s[0],s[1]) for s in sp])


O.engines=[
    ForceResetter(),
    InsertionSortCollider([Bo1_Sphere_Aabb()]),
    InteractionLoop(
        [Ig2_Sphere_Sphere_ScGeom()],
        [Ip2_FrictMat_FrictMat_FrictPhys()],
        [Law2_ScGeom_FrictPhys_CundallStrack()]
    ),
    #We compress the packing isotropicaly first
    PeriTriaxController( dynCell=True,mass=0.2,maxUnbalanced=0.01, relStressTol=0.01,goal=(-1e4,-1e4,-1e4), stressMask=7,globUpdate=5, maxStrainRate=(1.,1.,1.), doneHook='triaxDone()', reversedForces=True ,label='triax'),
    NewtonIntegrator(damping=.2),
    #PyRunner(iterPeriod=500,command='print "strain: ",triax.strain," stress: ",triax.stress')
]
O.dt=0.5*utils.PWaveTimeStep()
qt.View()

phase=0
def triaxDone():
    global phase
    if phase==0:
        print('Here we are: stress',triax.stress,'strain',triax.strain)
        #Here we reset the transformation, the compressed packing corresponds to null strain
        O.cell.trsf=Matrix3.Identity
        print('Now εxx will go from 0 to .4 while σzz and σyy will be kept the same.')
        triax.stressMask=6
        triax.goal=(-0.4,-1e4,-1e4)

        phase+=1
    elif phase==1:
        print('Here we are: stress',triax.stress,'strain',triax.strain)
        print('Done, pausing now.')
        O.pause()
